Zigil is known to be the Dwarvish word for 'silver', but the meaning of zirak is uncertain. Mannishtine refers to a high point or peak; it is probably a fair assumption that the Khuzdul word has a similar meaning. Zirak does appear in one other place, as a title or surname of Gamil the teacher of Telchar, so it probably carries the more general meaning of 'high' or 'tall'.